Pneumatic tire



G. M|CHAELSEN AND J. J. ROTH, Sn.

PNEUMATIC'TIRE.

APPLICATION man MAY 17. 1921.

1,401,483. Patented Dec. 27, 1921.

4o tially extending grooveorichannel 11 around improvements i Oneobject of a GEORGE mannerisms ames 3.3011311, sza, or New YORK, nil

land JULIUS {JL Ro'rir, Sn, citizens of the I United States, residing at New York, in the county of New York, saae or New York, have invented certain new and useful Im- 3 provements inPneumatic Tires; andwe do herebydeclare thjefollowing to be a full,

clear, and exaet description of the invention,

f such as Will enable others skilled in the art to which it appertains to make and use the This invention relates to new and fifl a jtires and particularly to pneumatic tires. a a

a removable tread for a pneumatic tire I, which is possessed of novel means whereby a, p it is firmly locked in the tire shoe against a I 20 a movement or displacement, while the tire a is inflated.

1 sectional view throughthe shoe and remov-l Another object is to provide a pneumatic tire having reinforcing means at the points of lock between the removable tread and the shoe, and alsoat such points as will practically eliminatethe danger of blow-outs.

Otherobjects and advantageswill be apparent-from the following description when taken in connection ,with the accompanying drawing. a p i In the drawing: a i

Figure 1 is a vertical transversesectional view through a pneumatic tire showing the removablevtread therein. p,

, Fig. 2 is ayerticaI longitudinal central able tread, on the line 2-2 of Fig. 1.

Referring particularly tothe accompanying drawing, represents the shoe of a pneumatic tire which has the circumferenits periphery, and formedin the center of this channel, andprojecting radially outa, p engaging flanges 10 of the shoe is embedded a triangular ring similar to the ring 13, as shown at 14. a l

having its transversely curved tread the invention is to provide PNEUMATIC Tran.

Patented Dec. 27, 1921. Serial No. 470,296. i

At opposite sides of the, channel 11 are" formed the circumferential ribs 15, which incline inwardly over the channel, and in the outer end face of each rib there is formed a longitudinal groove 16.

l he removable tread member comprises a r1ng17 formed of rubber and fabric, and

tion covered with a layer of live rubber 18.

This tread memberis transversely curved to conform to the corresponding curve of the tire shoe 10,,and fits within the channel 11 thereof, withthe reduced side portions 19 fitting into the grooves formed between the bottom of the channel 11 and the inner walls of the ribs 15. Formed centrally in the inner face of the tread member, and extending the entire lengththereof, is a groove or channel, dove-tail in outline, to receive the dove-tail rib 12. On the sides of the tread member, outwardly of the portions 19, there are formed the rounded projecting ribs or flanges 20 which are received in the grooves 16 of the ribs 15.

The outer face of the shoe 10, as well as] I the outer faces of the walls of the channel 11, the rib 12, and the ribs 15, are covered with live rubber 21.

In each side portion of the shoe 10 there is embedded an elongated triangular reinforcing ring 22, which serves to brace the ribs 15, and the adjacent walls of the chan- .nel 11, while at the same time so strengthenm he shoe as to reduce the danger of a blowout to a minimum.

What is claimed is: A pneumatic tire comprising a shoe having a circuinferentially extending central channel in the periphery thereof with the side walls undercut to form inwardly directed oblique marginal ribs, the end faces of the ribs being longitudinally grooved, a central oircumfereirtially ,exte11ding diovetail ribformed on the center of the bottom wall of the said channeland having a re- V a with circumferential side ribs seating withi the ru'n c lercut side gf the c ha nnel and in I In testimony whereof, we aifix our signathe: grooves .of the first ribs, respectively, tures, in the resence of two Witnesses.

said tread me mber having mgentral longi- 7 EORGE MIGHAELSEN. tudinal doj etail' grod'veTreceiVing-the cen JULIUS J. ROTH, SR. V5 tral rib of thgvchafmel, andfrictioncover- Witnesses Q ing's-on the vcontactingparts of the shoe and MI NIE FREDRICK,

tread member. f 4 Enwm 7H. COREY. 

